[Bug 31836] Add support for GStreamer 1.0 API/ABI

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=31836

--- Comment #33 from Andrew Eikum <aeikum at codeweavers.com> ---
(In reply to Rafał Mużyło from comment #31)
> Just before this bug gets closed, a question:
> What exactly is the purpose of 
> AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <gst/gst.h>]], [[static int
> a[sizeof(gint64) > 4 ? 1 : -1]; if (a[0]) return 0;]])
> 
> check ?
> 
> Cause, unless I'm missing something, that check was bogus even before glib
> 2.0.0.

The problem here is glib and gstreamer have different header files for 32- and
64-bit, but pkgconfig doesn't have a mechanism to specify which architecture's
headers you should get. This is really glib/gstreamer's fault. The vast
majority of libraries write their headers so the same header files work on
either architecture, and there is no need to configure pkg-config.

For most (all?) distros, the 64-bit glib/gstreamer headers are in the default
location, while the 32-bit ones are in some special location (in /usr/lib32/ on
Arch Linux). So pkg-config always gives the 64-bit headers, even when building
32-bit Wine, and this results in broken winegstreamer.

That check was added in b113af1b13455 to avoid building gstreamer if the
headers are for the wrong architecture.

This was discussed a bit on the ML in this thread:

https://www.winehq.org/pipermail/wine-devel/2016-January/111245.html

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